摘要
青藏高原北部柴达木盆地发育了巨厚的第四纪河湖相沉积。盆内沉积地层强烈的构造变形以及湖盆环境突变进一步证实了青藏高原经历了多期挤压隆升运动。沉积环境、介形虫和植物孢粉化石及磁性地层研究表明 ,自距今 2 5Ma以来 ,青藏高原共经历了距今2 5 2～ 2 2 8Ma,1 94～ 1 66Ma ,1 38～ 1 1Ma ,0 71～ 0 5Ma和 0 2 4～ 0 0 9Ma 5次强烈的隆升阶段 ,分别对应于青藏运动B幕和C幕、昆黄运动A幕和B幕以及共和运动。高原内、外
A thick succession of Cenozoic fluvial lacustrine sediments deposited in the Qaidam Basin accompanied with strong uplifting of the Qinghai Tibet (Xizang) plateau. Intensive tectonic deformation and abrupt shift of basinal sedimentary environments from 2.5 Ma ago revealed the Qinghai Tibet plateau having experienced the most fierce uplift since the late Cenozoic. The integrated studies of sedimentary environments, Ostracoda fossils, sporo pollen and magnetic stratigraphy indicated that the prolonged period of tectonic quiescence of the Qinghai Tibet plateau were punctuated by brief, intense interval of deformation and uplifting. Five episodic uplift movements were recognized, which occurred during 2 52～2 28 Ma ago,1 94～1 66 Ma ago, 1 38～1 1 Ma ago,0 71～0 5 Ma ago and 0 24～0 09 Ma ago respectively, and corresponding to the episodes B and C of the Qingzang orogeny, episodes A and B of the Kunhuang orogeny and the Gonghe movement. A comparative study of tectono sedimentary records in nine basins distributed in wide range of the Qinghai Tibet plateau further revealed a coincident and episodic uplift feature of the Qinghai Tibet plateau as a whole.
出处
《地质科学》
CAS
CSCD
北大核心
2003年第3期367-376,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国石油天然气集团公司"九五"重点攻关项目 ( 970 2 0 8 0 3 0 3)资助
关键词
柴达木盆地
第四纪
环境演变
构造变形
青藏高原隆升
构造运动
地层学
The Qaidam Basin, Quaternary, Tectonic deformation, Environmental evolution of lacustrine basin, Uplifting of the Qinghai Tibet plateau
